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| 型号： | IR3721MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MONITOR 10-DFN |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | TruePower™ |
| 应用： | 电源监控器 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 电流 - 电源： | 350µA |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN-EP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3721MTRPBFDKR |
IR3721
DATA SHEET
LAYOUT GUIDELINES
Refer to figures 7 through 11 for guidance laying out
the IR3721. These guidelines also apply to resistive
current sensing. The following guidelines will
minimize sources of noise and error, which is
required because millivolt level signals correspond to
amps of inductor current.
1. Place the capacitor Ccs2 close to the VO and
VCS pins of the IR3721. Treat VO and VCS as a
differential signal pair back to the IC as shown in
the elliptical area designated #1 of figure 8.
2. Sense the inductor (or shunt) Kelvin style at its
terminals. Route the leads back as a differential
pair. Refer to area #2 of figure 8.
3. Route signal VOUT back to the IC VK pin on its
own dedicated trace. Refer to area #3 of figure 8.
4. Place the thermistor near the inductor. Refer to
area #4 of figure 8. Route the thermistor leads
back to the rest of the network using differential
traces. Mount the rest of the thermistor network
consisting of Rs, Rp, and R1 close to the IC.
5. Use an isolated dedicated ground plane
connected only to components associated with
the IR3721 that connect to GND as shown in
figure 9. Connect this dedicated ground plane at
one location only to the ground of the monitored
voltage. The thermally relived via in figure eight
illustrates this connection.
6. Bypass IC VDD pin 5 to GND pin 4 with a high
quality 0.1 μ F ceramic capacitor. Refer to area #6
of figure 8.
7. Bypass the IC VK pin to GND with a high quality
0.1 μ F ceramic capacitor. Refer to area #7 of
figure 8.
1
L1
2
VOUT
Rcs1
Ccs1
VOUT
Rcs2
Ccs2
1
2
3
4
5
U1
CS VCC_1
VO VK
RT DI
GND_1 GND_3
VCC GND_4
10
9
8
7
6
R_DI_FILT
DI_FILT
Rs
IR3721
VDD
C_VDD
C_DI_FILT
Rp
Rth
0.1uF
C_VK
0.1uF
R1
GND
0
Figure 7 Example schematic
Page 11 of 16
www.irf.com
09/15/08
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| IR3725 | 制造商:IRF 制造商全称:International Rectifier 功能描述:INPUT POWER MONITOR WITH DIGITAL INTERFACE |
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| IR3725MPBF | 制造商:International Rectifier 功能描述:Power Monitor 12-Pin DFN EP 制造商:International Rectifier 功能描述:IR3725 Series 3.9 V 1126 kHz Input Power Monitor with Digital Interface - DFN-12 |
| IR3725MTRPBF | 功能描述:电流和电力监控器、调节器 INPUT PWR MONITOR IC 12V Rail 3.1 VDD RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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